Radiochemotherapy with Gemcitabine in Unresectable Extrahepatic Cholangiocarcinoma: Long-term Results of a Phase II Study

Purpose: To evaluate the outcome of patients affected by unresectable extrahepatic cholangiocarcinoma treated with radiotherapy (ERT) and concurrent gemcitabine-based chemotherapy with or without intraluminal brachytherapy (BT).

Patients And Methods: Twenty-seven patients underwent weekly gemcitabine (100 mg/m(2)) as a 24-h infusion during the course of three-dimensional radiotherapy (50.4 Gy to the tumor and 39.6 Gy to the nodes). Among them, certain patients received a boost of intraluminal high-dose rate (HDR) brachytherapy with 192 Ir. The outcome of patients was evaluated in terms of response to therapy, local control (LC), overall survival (OS) and toxicity.

Results: We analyzed a total of 27 patients with the diagnosis of unresectable, non-metastatic adenocarcinoma of the extrahepatic biliary ducts, treated with radiochemotherapy with gemcitabine. After a dose of 50 Gy, a boost of HDR intraluminal brachytherapy was administered in 6 patients (22%): 4 patients received 15 Gy and 2 patients 20 Gy. With a median follow-up of 16 months (range=3-52 months), for the entire group, 2-year LC was 29% (median=12 months), 2-year MFS was 36% (median 16 months). Two-year and three-year OS were 27% and 7% respectively, with a median of 14 months. Toxicities were acceptable. Median OS in patients treated with brachytherapy boost was 21 months versus 14 months for the group treated with gemcitabine-based radiochemotherapy only; 2-year LC was 53% versus 25%, respectively.

Conclusion: Gemcitabine appears to be a potent radiation sensitizer, and when combined with radiation therapy, it shows encouraging tumor response. Moreover, patients treated with a boost of brachytherapy after radiochemotherapy seem to have a better local control with an acceptable toxicity. Further investigation is warranted to confirm these data and define the optimal combined treatments.